Huawei Quidway R2600 Series

Installation Manual
Quidway R2600/3600 Series Modular Routers
Chapter 8
Function Modules
8-18
Enlarged A side
Pos .1
Pos.50
Db50 Male
Label
DB25 Femal e
Enlarged B side
Pos.1
Pos.25
B
A
Figure 8-22 EIA-232 (V.24) DCE cable
Table 8-13 EIA/TIA-232 DCE cable pinouts (DB-50 ↔ DB-25)
DB-50 Signal Description Direction DB-25 Signal
5 TxD/RxD Twisted pair no. 5
→
3RxD
27 RxD/TxD Twisted pair no. 9
←
2TxD
2 RTS/CTS Twisted pair no. 4
→
5CTS
31 CTS/RTS Twisted pair no. 10
←
4RTS
26 DTR/DSR Twisted pair no. 3
→
6DSR
1 LL/DCD Twisted pair no. 2
→
8 DCD
4 TxCE/TxC Twisted pair no. 7
→
15 TxC
29 NIL/RxC Twisted pair no. 6
→
17 RxC
30 DCD/LL Twisted pair no. 12
←
18 LTST
6 DSR/DTR Twisted pair no. 11
←
20 DTR
28 RxC/TxCE Twisted pair no. 8
←
24 TxCE
50 GND Single - 1 Shield_GND
7 GND Twisted pair no. 1 - 7 Circuit_GND
21 MODE-0 Shorting group GND - -
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Note:
The pins not referenced in the above table are not connected.
z
V.35 DTE